module.exports = function (title) {
  document.title = title
  var mobile = navigator.userAgent.toLowerCase()
  if (/iphone|ipad|ipod/.test(mobile)) {
  var iframe = document.createElement('iframe')
  iframe.style.display = 'none'
  // 替换成站标favicon路径或者任意存在的较小的图片即可
  iframe.setAttribute('src', '/favicon.ico')
  var iframeCallback = function () {
  setTimeout(function () {
  iframe.removeEventListener('load', iframeCallback)
  document.body.removeChild(iframe)
  }, 0)
  }
  iframe.addEventListener('load', iframeCallback)
  document.body.appendChild(iframe)
  }
  }